Loyal definition: faithful to one's sovereign, government, or state.. See examples of LOYAL used in a sentence. loyal meaning, definition, what is loyal : always supporting your friends, principl...: Learn more. Master the word " LOYAL " in English: definitions, translations, synonyms, pronunciations, examples, and grammar insights - all in one complete resource. The meaning of LOYAL is unswerving in allegiance. How to use loyal in a sentence. Synonym Discussion of Loyal .